Perception of Blur in Optometric Tests
Arthur Layton, Judith Dickinson, MARILYN PLUZNICK · Optometry and Vision Science · 1978
Sensitivity to blur detection was measured for 30 optometric patients by having them match the clarity [or blur] of the target words at the test endpoint with 1 of an identical set of photographically defocused words. The group showed considerable variance in their blur scores which approached a normal distribution. Some clinical implications are discussed.